Meter bridge || carbon code resistors

Meter Bridge|Questions

In the given Wheatstone bridge, the current in the resistor 3 R is zero. Find the vlaue of R, if the carbon resistor, connected in one arm of the bridge, has the colour sequence of red, red and orange. The resistance of BC and CD arms are now interchanged and another carbon resistance is connected in place of R so that the current through the arm BD is agian zero. Write the sequence of colours bands of this carbon resistor. Also find the nature of current through it.

The value of the resistance of a carbon resistor having the standard colour - coding as shown in the figure is n G Omega pm 5% . What is the value of n ?

Why is the meter bridge suitable for resistance of moderate values only ?

Why is the meter bridge method considered unsuitable for the measurement of very low resistances ?

Meter Bridge And Potentiometer

The Wheatstone bridge shown in Fig. here, gets balanced when the carbon resistor used as R_(1) has the colour code (Orange, Red, Brown). The resistors R_(2) and R_(4) are 80 Omega and 40 Omega , respectively. Assuming that the colour code for the carbon resistor, used as R_(3) , would be:

Why are the connecting resistors in a meter bridge made of thick copper strips ?

Explain colour code for carbon resistors with illustrations.